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W. H. BANGROPT &W. L. WARD.

STEAM ENGINE.

No. 68,938. Patented Sept. 17, 18-67.

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WILLIAM H..BANCROFT AND WILLIAM L. WARD, O F PORTLAND, WISCONSIN.Letters Patent No. 38,938, dated September 17, 1867.

IMPROVEMENT Ill STEAM ENGINES.

To ALL WHOM IT MAY CONCERN:

Be it known that we, WILLIAM H. HAM-norm and WILLIAM L. Warn, ofPortland, in the county of Dodge, and State of Wisconsin, have inventeda new and useful Improvement in Steam Engines; and ivc do hereby declarethat the following is a full, clear, and exact description of the same,reference being bad to the annexed drawings, making part of thisspecification, in which- Figure 1 is a perspective vien.

Figure 2 is a cross-section of the ways and cross-heads Figure 3 is alongitudinal section of the main cylinder.

Figure 4 is a vertical longitudinal section of the first cylinder.

Figure 5 is a horizontal section of both cylinders.

The same letters are employedin the designation of identical ports'inall the figures.

A represents the shears, of suitable arrangement to support the'mcchanism of the engine, on which rest the two cylinders B and C. Thecylinder B we denominatc the .irst cylinder, which receives the steamand performs the function of an ordinary cylinder, and also, incombination "with the piston, acting as a cut-oil. The second cylinder Gwe will denominate the main cylinder. The first cylinder is divided intoequal compartments by a partition, B. Wo pluce over the centre anyproper valve, D, operated by the rods 1) attached to an eccentric on theshaft in the usual manner. E is the piston-rod of the first cylinder,which passes through the cylinder-head and through the partition B. Ithas attached to it the pistonheads E and E in the respectivecompartments. Steam is admitted to these coinpartmcnts through the portsF and F placed on each side of the partition B, and it escapes throughtheexit ports G G in the opposite ends of the compartments. Thecylinders are connected by open ports, .at H H, at theends oi the maincylinder, on opposite sides of the pistonhead C The piston-rods arerespectively connected with the cross-hearls'I I running upon parallelways K K K, and these are connected, by ordinaryconnecting'rods, withthe arms L and Lof a double crank, set at right angles to one another onthe ends of the main shaft.

The operation of this engine is as follows: The piston-heads being asshown in fig. 4, steam will enter through the portF and, drive forwardthe piston-head E. When thc'piston-head has passed the port H the steamwill rush into the main cylinder C, behind the piston-hoad O and "driveit in a direction opposite to that, traversed by the piston-head E. Whenthe latter has reached tho end of the cylinder the steam will beadmitted through the port F, in front of the piston-head E, and driveboth piston-heads in the opposite-direction. The pistouvheads will passthe'ports H and'H at the some time, so that as soon as steam .isadmitted through the port H the port H will be opened, and the exit ofthe steam from that side of the piston-head G will be per-- mitted. g

What we claim as our invention, and desire to secure by Letters Patent,is-.

The combination of the first cylinder B, having acentral partition, B,and the main cylinder C, with their respective pistons, said cylindersbeing co'nstrncted as to their ports, and arranged in relation to oneanother and to said pistons, substantiully as described.

In testimony whereofwo'havesignodour names to this specification intheprcsence of two subscribing witnesses.

WILLIAM- H. BANGROF'I, WILLIAM L. WARD.

Witnesses:

ABEL BANcnorr, Gnonsn A. Nnnsox.

